Physics — Autumn PLC Extras

What is the energy transferred by an electrical appliance measured in?

Joules

What does the power rating of an electrical appliance tell you?

The rate at which it transfers energy

What is the equation linking energy power and time?

Energy = power x time

What is the equation linking power energy and time?

Power = energy ÷ time

What does a higher power rating mean?

More energy is transferred each second

What is specific heat capacity?

The energy required to raise the temperature of 1 kilogram of a substance by 1°C

What is the unit of specific heat capacity?

Joules per kilogram per degree Celsius

What is the equation for specific heat capacity?

Energy = mass x specific heat capacity x temperature change

What happens to particles when a substance is heated?

Their kinetic energy increases

What is an electric charge?

A property of matter that can be positive or negative

What are the two types of electric charge?

Positive and negative

What happens when two like charges are brought together?

They repel

What happens when two opposite charges are brought together?

They attract

What is an electric field?

A region where an electric charge experiences a force

What is the direction of an electric field around a positive charge?

Away from the positive charge

What is the direction of an electric field around a negative charge?

Towards the negative charge

What happens to the current at different points in a series circuit?

It is the same everywhere

What happens to the potential difference in a series circuit?

It is shared between the components

What happens to the resistance when more resistors are added in series?

The total resistance increases

What happens to the current in a parallel circuit?

It splits between the branches

What happens to the potential difference across components in parallel?

It is the same across each branch

What happens to the total resistance when another branch is added to a parallel circuit?

The total resistance decreases

What happens if one component breaks in a series circuit?

The whole circuit stops working

What happens if one component breaks in one branch of a parallel circuit?

The other branches can continue working